How do I get Office to connect back to my email. I think this happened because

I deleted the "free" 365 software from my new computer and have Office for Home and School. The internet says to choose a default app and then to connect to Office but as with most (all) things MS, this does not work. I have Windows10 and Office 2019. Thanks in advance.
Tried this but cannot get any further than just choosing my default email: "To set the default mail handler in Windows 10 or 8.1, right-click on Start > select Control Panel > Default Programs > Set your default programs > click on the appropriate email program in the list > select "Choose defaults for this program" > under MAPI, check "Send Mail" and click Save > click on the appropriate"
The MAPI is what the message says for why I cannot attach my documents and send. Sure hope someone out there can help. (I am connected to and receiving messages from both email accounts.)